Mold design and construction requires special attention for optimal product quality and reliable molding. A detailed specification is required in advance: 
 -product shape and tolerances
 -mold in relation to molding equipment
 -parting lines; venting
 -number of cavities 
 -runner lay-out and gating system 
 -ejection system 
 -cooling system lay-out 
 -type of tool steel 
 -surface finish.